Amino acid derivatives and their use as pesticides

Abstract

The invention relates to novel amino acid derivatives, to a process for their preparation and to their use as pesticides, in particular as fungicides, and as intermediates for preparing known substituted amino acid derivatives with fungicidal activity.

We claim: 
     
       1. A compound of the formula (Ia): ##STR9##  in which R 1  represents chlorine, methyl, ethyl or methoxy; or a salt thereof. 
     
     
       2. A pesticidal composition comprising a pesticidally effective amount of a compound or salt according to claim 1 and a carrier. 
     
     
       3. A method of combating unwanted pests comprising administering a pesticidally effective amount of a compound or salt according to claim 1 to the pests, their habitat or to a place from which it is desired to exclude such pests. 
     
     
       4. The method according to claim 3, wherein the pests are fungi and the compound or salt is applied to an above-ground part of a plant, to a seed or to the soil. 
     
     
       5. A process for preparing a compound according to claim 1, said process comprising reacting 4-isopropyl-2,5-oxazolidinedione of the formula: ##STR10## with an amine of the formula: ##STR11## in which R 1  represents chlorine, methyl, ethyl or methoxy; in the presence of a diluent and, optionally, in the presence of a reaction aid.